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A survey was conducted at Crompton and Knowles Corporation, Dyes and Chemicals Division, (SIC-2865) Reading, Pennsylvania, to determine whether N-nitroso compounds are contaminated in the azo dye factories, where sodium-nitrite (7632000) and sometimes secondary or tertiary amines are used as raw materials for dye synthesis. Seven air samples were collected and sampled through either midget impingers containing 15ml/1N KOH or vacuum traps containing 45ml/1N Koh at ambient temperature. The sample (15ml) was loaded onto a Jet Tube pre-impregnated with 15ml dichloromethane (75092). GC/TEA (66400) conditions were used for volatile nitrosamine detection. HPLC-TEA was constructed by sequentially connecting a high pressure pump, an injector, a Lichrosorb Di60 Column, and a TEA (66400). Solvent systems used were 60% acetone (67641) and 40% isooctane (540841), 50% acetone and 50% isooctane, 35% acetone and 65% isooctane, 25% acetone and 75% isooctane, and 12% acetone and 88% isooctane. At a detection limit of 0.5 micrograms/g, two raw materials samples, both chlorinated nitroanilines, were found to be TEA responsive compounds. Three press cake samples of the disperse dyes all contained one TEA responsive compound at concentrations of 406, 3034, and 491 micrograms/g. TEA responsive materials were found in every finished product of the disperse dyes. All the dyes samples contained terminal substituted amino groups; TEA responsive compounds were found in every sample. Whether the TEA responsive compounds were present in factory air was inconclusive.